How do I have the cursor placed in a dropdown field on page load using jsf?
when I load a page , the curso开发者_如何学Pythonr must point to drop-down field , using jsf.I am new to JSF.
When the page is finished loading in webbrowser, JSF has already done its job of generating a bunch of HTML on the webserver and sending it to the webbrowser. It can't do any much more for you after that point. You need to use JavaScript for this job. It is able to execute code when the page is finished loading and it has access to all elements in the HTML DOM tree.
So, if you specify a fixed ID for the dropdown element in JSF,
<h:form id="myform">
<h:selectOneMenu id="mydropdown">
...
</h:form>
then you must be able to grab it by JavaScript:
var mydropdown = document.getElementById('myform:mydropdown');
In JavaScript, you can use element.focus() to set the focus on the element:
mydropdown.focus();
To get it to execute then the page is finished loading, you need to hook a function to window.onload:
window.onload = function() {
var mydropdown = document.getElementById('myform:mydropdown');
mydropdown.focus();
}
That's it. Put it in a <script> somewhere near the bottom of the <head> or a .js file which you include by <script src>.
JSF is a server side technology and this type of behavior requires Javascript. Try to write a Javascript to do this in a regular HTML page first. Once you have figured out how to do this you can try to use this script in your JSF page.
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